Raspberry-like Silica Hollow Spheres: Hierarchical Structures by Dual Latex-Surfactant Templating Route

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• 作者：Xiaofeng Wu ; Yajun Tian ; Yanbin Cui ; Lianqi Wei ; Qi Wang ; Yunfa Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：July 12, 2007
• 年：2007
• 卷：111
• 期：27
• 页码：9704 - 9708
• 全文大小：397K
• 年卷期：v.111,no.27(July 12, 2007)
• ISSN：1932-7455

文摘

Raspberry-like hollow SiO₂ spheres were synthesized successfully through a dual latex-surfactant templatingroute. In this approach, cationic cetyltrimethylammonium (CTA⁺) micelles and microscale polystyrene (PS)latex were employed as structure-directing templates for constructing the inorganic hollow SiO₂ spheres withhierarchical structures. The final product has been analyzed scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), single-angle X-ray diffraction (SAXRD), Brunauer-Emmett-Teller (BET) measurements, and Hg porosimetry measurements. The as-obtained hollow SiO₂ spherespresent a novel raspberry-like protruding surface morphology and possess hierarchical porous shells. Moreover,the factors that could impact the surface morphology and hierarchical porous structure are discussed, and thecorresponding mechanism was proposed accordingly. This dual templating route is expected to be an effectivemeans to pattern multiscale structures in the shell of the SiO₂ microspheres; hence their potential applicationscould be greatly broadened.